Die for heading bolts



UNITED STATES PATENT OFFICE.

ALVIN POND, OF MARION, CONNECTICUT.

DIE FOR HEADING BOLTS.

SPECIFICATION forming part of Letters Patent No. 243,967, dated July 5,1881,

Application filed April 11, 1881. (No model.)

To all whom it may concern:

Be it known that I, ALVIN POND, of Marion, in the county of Hartford andState of Connecticut, have invented a new Improvement in Dies forHeading Bolts; and I do hereby declare the following, when taken inconnection with the accompanying drawings and the letters of referencemarked thereon, to be a full, clear, and exact description of the same,and which said drawings constitute part of this specification, andrepresent, in

Figure 1, a vertical central section of the three (lies; Fig. 2, a topview of lower die; Fig. 3, the blank after first operation; Fig. 4, theblank after second operation; Fig. 5, the blank finished.

This invention relates to an improvement in dies for forging bolts ofthat class in which the head is square. Usually square-headed bolts aremade by upsetting, and at the same time striking transversely to formthe sides.

The object of this invention is to shape the bolt complete in the simpleoperation of upsetting, whereby the mechanism usually required for thetransverse striking is avoided and the invention consists in the seriesof dies hereinafter described, and as shown in the accompathe usualmanner for heading bolts.

nying illustration.

A represents the lower or stationary die, in which are three cavities, B(J D, each corresponding in shape to the cylindrical body of the bolt,except at the face or anvil end of the die. The die A is in two partsand arranged to gripe upon the body of the blank, so as to hold itfirmly against the upsetting force in At the face end of the die thefirst cavity, B, is countersunk, so as to form an outwardly-inclinedenlargement, as at a. The second cavity, 0, has a like countersink, butslightly larger. The third and finishing cavity has a recess, cl, cut atthe anvil end corresponding to the four sides of the head, and in depthsufficient to inclose the four sides of the entire finished head, and soas to leave a square shoulder at its junction with the cylindrical partof the cavity D. The other or movable part of the die E has a cavity, F,in line with the cavity B, in the shape of a frustum of a cone, itsouter or larger end corresponding in diameter with the countersink a inthe part B. It is also constructed also the countersink a in the part A.The part E is then forced upon the blank, upsetting the end, so as tofill the cavity F and countersink, as seen in Fig. 3. It is thentransferred to the second cavity, G, with the shoulder f resting in thecountersink. Then the part E is forced on the projecting end, whichupsets the blank, as seen in Fig. 4, leaving the same incline underneaththe enlarged part. It is then transferred into the'third cavity, D, withits shoulder f resting on the shoulder e of the cavity. The two parts ofthe die are brought together to close upon the body of the blank whichcompresses the sides of the enlarged part of the blank in the cavity D,and reduces it to the shape of the cavity-that is, four square sides.Because of the tapering shape of the enlargement the head comes squarein the lower part of the die and leaves the corners rounded, as seen inFig. 5-the usual and desirable shape for this class of bolts. After thusshaping by side compression the follower is brought down on the head toflatten its face.

B y this construction no trimming of the head is necessary. It ispositively central, and, because of the inclined under side of theenlargement made by the countersinks in the first and second cavities,there is no liability to coldshuts, flaws, or breaks at the junction ofthe head with the body.

The first cavity may in some cases be dispensed with, and the upsettingand enlargement formed in the second cavity alone but in larger boltsthe two preparatory operations produce the best results.

The parts of the die which perform the first and second operations-thatis, the first and second cavities-are substantially the same as that forwhich Letters Patent were granted to myself and Frost April 12, 1881. Itherefore do not claim dies having those cavities,except in combinationwith the peculiar third or finishing cavity.

I claim- Theherein-described dies for making squareheaded'bolts,consisting of the lower part, A, made in two parts, constructed with acavity, 0, corresponding to the body of the blank, and so as to graspthe same, countersunk at its face end I), and also with a cavity, D, ofthe shape of the body of the blank, with a recess, d, at its face endcorresponding to the square head shape to be produced, the division inthis part A being longitudinally central through said cavities, combinedwith an upper or second 1 5 part, E, constructed with a cavity, G, ofsubstantial] y frusturn-of-a-cone shape, in line with thebefore-mentioned cavity 0 in the part A, the face of said second part,E, adjacent to the second cavity D in the part A being flat, and 50 sothat the blank upset in the cavity G will be squared in the cavity])when the two parts of A are closed upon the blank, substantially as

